In German without an English-language abstract. The thesis is that there is no contradiction between OA and quality, and that the conventional metrics of quality, such as impact factors, are deeply misleading.
Because the article is a PDF, I can't link to a machine translation. But you can read today's (HTML) press release on the article in German or Google's English.
PS: For my own arguments for the same thesis, see especially:
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.